Machines for forming wound rolls of sheet material

ABSTRACT

The invention is concerned with securing the tails or free ends of rolls of sheet material by applying to the outside of each roll at least one annular band of a liquid adhesive and is described in the specification with reference to a preferred form of machine for use with newly wound logs of toilet tissue which are to be cut up into standard size rolls. This machine essentially comprises two sets of rollers, one set of which dip into a tray of liquid adhesive, delivery means for receiving logs one at a time from a winding machine and feeding them into the nip between the sets of rollers and ejector means operative in unison with the delivery means to remove each log from the nip after the rollers have completed more than one revolution in contact therewith.

United States Patent Preen [451 Oct. 10, 1972 [54] MACHINES FOR FORMING WOUND 792,394 6/1905 Buchanan ..1 18/69 ROLLS OF SHEET MATERIAL 3,269,355 8/1966 Tarrant ..1 18/219 [72] Inventor. Robert Preen, Clifton, England Primary Examiner john P. McIntosh [73] Assignee: T. H. Dixon & Company Limited, Atmmey Nnis & Bateman Letchworth, Hertfordshire, England [22] Filed: Aug. 29, 1968 ABSTRACT {211 A N 756,250 The invention is concerned with securing the tails or free ends of rolls of sheet material by applying to the outside of each roll at least one annular band of a [30] Forelgn Apphcamn Pnomy Data liquid adhesive and is described in the specification Aug. 29, 1967 Great Britain ..39,467/67 with reference to a preferred form of machine for use with newly wound logs of toilet tissue which are to be [52] US. Cl. ..ll8/5, 118/60, 118/219, cut up into standard size rolls, This machine essen- 118/233 tially comprises two sets of rollers, one set of which [51] Int. Cl ..B05c 1/02 i i a tray f liquid adhesive, delivery means f [58] Field of Search ..1 18/219, 233, 59, 69, 202, receiving logs one at a time from a winding machine 118/225 60 and feeding them into the nip between the sets of rollers and ejector means operative in unison with the [56] References and delivery means to remove each log from the nip after UNITED STATES PATENTS the rollers have completed more than one revolution in contact therewith. 306,419 10/1884 Nichols ..-..1l8/233 512,403 I/ 1894 Solter ..1 18/219 X 14 Claims, 2 Drawing Figures PAIENTEDnm 10 1912 3696'? saw 1 er 2 INVENTOR:

ROBERT PREEN Attvs.

PATENTEDflCT10l972 3' 696' 777 SHEET 2 or 2 INVENTOR:

ROBERT PREEN ttvs.

MACHINES FOR FORMING WOUND ROLLS OF SHEET MATERIAL This invention relates to the rewinding of continuous webs of sheet material into rolls of predetermined diameter or reeled length and its object is to secure the tail or free end of each completed roll to prevent any tendency' of the roll to unwind during subsequent cutting or other operations performed thereon.

This is effected, according to the invention, by applying to the outside of the roll at least oneannular band of a material, in liquid form at the time of application, which is capable of effecting at least temporary adhesion of the tail of the roll to the next layer of material without impregnating underlying layers thereof.

The invention is particularly applicable to the securing of the tails of long rolls or logs of toilet tissue wound on high-speed machines prior to cutting the logs into rolls of standard length and apparatus designed for this purpose will be described hereinafter with reference to the accompanying drawings in which:

FIG. 1 is a transverse section through the apparatus; and

FIG. 2 is an end view of the apparatus looking in the direction of the arrow II in FIG. 1, with parts broken away for greater clarity.

The apparatus shown, which is designed as an adjunct to a high speed winding machine for rolls of toilet tissue, is mounted in a frame including longitudinal members 1 tissue, 2 and end members 3 and 4. Secured by brackets 4 and 5 to the frame members 1 and 2 are upright transverse members 6 and 7 which support, by means of brackets 8 and 9, a tray 10 containing a waxlike adhesive material which is solid at room temperature and is maintained in a liquid state by a thermostatically-controlled electric strip heater 11. The type of adhesive employed is dependent, to some extent, upon the texture of the material forming the rolls to be treated. A suitable form of adhesive for use on soft toilet tissues has been found to be a blend of synthetic resins known as adhesive wax and supplied by the British firm, Glostics Limited of Gloucester against their reference XW3. Journalled in the frame members 6 and 7 above the tray 10 are parallel shafts 12 and 13 on which are mounted sprockets 14 and 15 respectively driven by a chain 16 passing over an idler sprocket 17 on the frame member 6 and around a sprocket 18 on the output shaft 19 of a worm-geared motor 20, mounted on a transverse base member 21 extending between and secured to frame members 1 and 2, the drive to said sprocket 18 being through a friction coupling which permits the drive to slip on overload, for example, when the motor is started with the adhesive in the tray still at room temperature. The shaft 12 which is adjustably mounted in slots 22 in the frame members 6 and 7, carries a plurality of disc-like rollers 23 which dip into the adhesive in the tray 10 and are heated by a thermostatically controlled electric heater (not shown) of circular crosssection passing through the center of the shaft from a terminal box 24. The shaft 13 carries an equivalent numberof rollers 25 which register with the rollers 23 and are cooled by water circulated through the center of the shaft. The distance of the rollers 23 from the rollers 25 is less than the diameter of the rolls to be received from the winding machine and the means for transferring these rolls one at a time into the nip between the rollers 23 and 25 and for subsequently ejecting each roll after the securing of its tail will now be described.

Secured to the frame member 2 intermediate its length are two upright members 26 to the upper end of which are secured cantilever members 27 carrying a rotatable shaft 28 which is connected by an arm 29 to the upper end of a pneumatic actuator 30 pivotally mounted at its lower end in the frame members 26 and operative, upon receipt of a signal from the winding machine, to rotate the shaft 28 first anticlockwise, then clockwise, as viewed in FIG. 1, through a predetermined arc of revolution. ,Secured to the shaft 28 is a pair of arms 31 upon which is pivotally mounted a trough 32 by means of pins 33 which extend through the arms and the ends of the trough into engagement with guide members 34 and 35 secured to the frame members 6 and 7 respectively. A further pair of arms 36 are secured adjacent their lower ends to the ends of the trough 32 and are formed with slots 37 into which project pins 38 secured to the frame members 6 and 7. Also secured to the shaft 28 is a pair of ejector rods'39 which extend downwardly to a point immediately above the rollers 23 and are provided at their lower ends with ejector bars 40.

Before commencing operation current is supplied to the heater 11 in the tray 10 to bring the adhesive therein to a liquid state and to the heater in the shaft 12 for maintaining the rollers23 at a temperature sufficiently high to maintain the adhesive picked up thereby in a liquid state during application to a wound roll. At the same time cooling water is supplied to the shaft 13 to aid in rapid drying or setting of the adhesive mate rial after application to each wound roll. With the adhesive in the tray 10 in a liquid state the motor 20 is started to drive the shafts l2 and 13 at a constant speed in an anti-clockwise direction as viewed in FIG. 1 and the rollers23 pick up a film of adhesive from the tray 10, which film is regulated by an adjustable scraper 41. With the trough 32 inthe position shown in broken lines in FIG. 1 it receives a newly wound roll from the winding machine which simultaneously transmits a single initiating operation of the pneumatic actuator 30. When the roll enters the trough its ends engage discshaped abutments 42 on the inner ends of the pins 33 which are pressed outward into engagementwith the guide members 34 and 35 to maintain the roll properly located in the trough. The operating rod of the pneumatic actuator is first moved outward to rotate the shaft 28 anti-clockwise as viewed in FIG. 1 and move the trough 32 downwards through the position shown in FIG. 1 to a point immediately above the rollers 23 and 25. During its downward movement the trough 32 is rotated in a clockwise direction through about due to the pin and slot connection between the arms 36 and frame members 6 and 7 so that when it reaches its lowest point and the pins 33 lose contact with the guide members 34 and 35 the roll drops out of the trough into the nip between the rollers 23 and 25. There a thin film of adhesive in the form of an annular bandis transferred to the roll from the surface of each of the rollers 23 and to ensure adequate securing of the severed tail the return stroke of the actuator 30 is delayed by a suitable device, not shown, until the roll has made more than one but less than two complete revolutions. On its return stroke the actuator 30 moves its operating rod inwards to rotate the shaft 28 in a clockwise direction whereuponthe ejector bars 40 on the ends of the rods 39 engage the sealed roll and eject it through the gap between the rollers 25 and the ascending trough 32 which at the end of the stroke attains once again the position shown in broken lines in FIG. 1 ready to receive the next newly wound roll whereupon the cycle is repeated.

The operation of the actuator 30 is synchronized with the winding and sealing mechanism to ensure continuous operation and the number of rollers on each of the shafts 12 and 13 is preferably so chosen that after cutting each roll into smaller rolls of the required size, each of the latter will be coated with at least one band of adhesive. I

Instead of employing rollers'dipping into a tray the adhesive material may be applied to the rotating rolls by spray coating or other suitable means.

I claim:

1. Apparatus for securing the tail or free end of an elongated wound roll of sheet material that has been wound on a high speed winding machine prior to severing that elongated roll into a plurality of wound rolls of required smaller lengths comprising means for supporting and rotating said elongated wound roll about its longitudinal axis andfor substantially simultaneously applying and fixing a series of separate circumferential bands of adhesive around the outer surface of said rotated elongated roll in such spaced relation as to provide an adhesive band for each smaller length rollafter the elongated roll has been severed including a first supporting roller having a series of peripheral portions arranged to apply the bands of adhesive about the elongated roll and a second supporting roller having a series of peripheral portions aligned with said first supporting roller peripheral portions to fix the bands of adhesive as they are applied to the elongated roll, means to apply said adhesive to the peripheral portions of said first supporting roller, said second supporting roller including means for cooling at least said second roller peripheral portions to fix the'bands of adhesive as they are applied to the elongated roll.

2. Apparatus for securing the tail or free end of wound roll of sheet material comprising a reservoir for containing adhesive material in liquid form, means positioning and rotating a wound roll of said material disposed for applying said adhesive material to the outside surface of said rotating wound roll in the form of a circumferential band around the roll comprising a first roller rotatably mounted above said reservoir with a portion of its periphery dipping into said adhesive material, a .second roller rotatably mounted about an axis parallel to said first roller and spaced therefrom by between said rollers for support and rotationthereby, andejector means operable in synchronism with said delivery means for ejecting a roll from said positioning and rotating means after application of said band of adhesive material to said roll.

3. Apparatus according to claim 18, wherein said adhesive material is a mixture of synthetic resins.

4. Apparatus according to claim 18, wherein said adhesive material is solid at room temperature and heating means are provided in said reservoir and said first roller for maintaining said material in a liquid state.

5. Apparatus according to claim 4, wherein said heating means comprises thermostatically controlled electric heaters.

6. Apparatus according to claim 2, wherein saidrollers are operatively connected to an electric driving motor-through a friction coupling which enables the drive to slip under overload conditions.

7. Apparatus according toclaim 2, wherein an adjustable scraper is provided for regulating the amount of adhesive material picked up by said first roller. 1

8. Apparatus according to claim 2, wherein a plurality of said first and second rollers are respectively mounted at intervals on a pair of parallel shafts.

9. Apparatus for forming wound rolls of sheet material comprising a reservoir for containing adhesive material in liquid form, a first roller rotatably mounted above said reservoir with a portion of its periphery dipping into said adhesive material, a second 'roller rotatably about an axis parallel to said first roller and spaced therefrom by an amountless than the diameter of a roll of said material to be treated, means for cooling said second roller by water circulated therein, means for driving said rollers at the same speed in the same direction, delivery means for receiving a wound roll of said material and depositing it in the nip between said rollers, and ejector means operable in unison with said delivery means for ejecting a roll after application of a circumferential band of adhesive material thereto.

10. Apparatus for forming wound rollsof sheet material comprising a reservoir for containing adhesive material in liquid form, a first roller rotatably mounted above said reservoir with a portion of its periphery dipping into said adhesive material, a second roller rotatably mounted about an axis parallel to said first roller and spaced therefrom by an amount less than the diameter of a roll of said material to be treated, means for driving said rollers at the same speed in the same direction, delivery means for receiving a wound roll of said materialand depositing it in'the nip between said rollers, said delivery means including a trough pivotally mounted on arms secured to a shaft which is alternately rotatable in opposite directions by a pneumatic actuator the delivery stroke of which moves said trough from an upper position in which it receives a wound roll to a lower position in which it deposits the roll in the nip between said rollers, and the return stroke of which is operative to return said trough to its upper position, and ejector means operable in synchronism with said delivery means forejecting a roll after application of said band of adhesive material thereto- 1 1. Apparatus according to claim 10, wherein means secured to the ends of said trough and having a pinand-slot connection with parts of a fixed frame are operative to pivot said trough relative to said arms during-its movement between said upperand lower positions. I

12. Apparatus according to claim vl0, wherein said trough is pivotally mounted on pins the outer ends of which engage cam-like guide members on parts of a fixed frame and the inner ends of which serve to engage and locate the ends of a roll during delivery movement of the trough.

13. Apparatus according to claim 10, wherein said ejector means comprises rods secured to said third shaft and movable thereby into engagement with a roll during the return stroke of said actuator to eject the 

1. Apparatus for securing the tail or free end of an elongated wound roll of sheet material that has been wound on a high speed winding machine prior to severing that elongated roll into a plurality of wound rolls of required smaller lengths comprising means for supporting and rotating said elongated wound roll about its longitudinal axis and for substantially simultaneously applying and fixing a series of separate circumferential bands of adhesive around the outer surface of said rotated elongated roll in such spaced relation as to provide an adhesive band for each smaller length roll after the elongated roll has been severed including a first supporting roller having a series of peripheral portions arranged to apply the bands of adhesive about the elongated roll and a second supporting roller having a series of peripheral portions aligned with said first supporting roller peripheral portions to fix the bands of adhesive as they are applied to the elongated roll, means to apply said adhesive to the peripheral portions of said first supporting roller, said second supporting roller including means for cooling at least said second roller peripheral portions to fix the bands of adhesive as they are applied to the elongated roll.
 2. Apparatus for securing the tail or free end of a wound roll of sheet material comprising a reservoir for containing adhesive material in liquid form, means positioning and rotating a wound roll of said material disposed for applying said adhesive material to the outside surface of said rotating wound roll in the form of a circumferential band around the roll comprising a first roller rotatably mounted above said reservoir with a portion of its periphery dipping into said adhesive material, a second roller rotatably mounted about an axis parallel to said first roller and spaced therefrom by an amount less than the diameter of a roll of said material to be treated, said second roller including means for cooling said second roller to fix adhesive material applied to the rotating wound roll by said first roller portion dipping into said adhesive material, means for driving said rollers at substantially the same speed in the direction, delivery means for receiving a wound roll of said material and depositing it in the nip between said rollers for support and rotation thereby, and ejector means operable in synchronism with said delivery means for ejecting a roll from said positioning and rotating means after application of said band of adhesive material to said roll.
 3. Apparatus according to claim 18, wherein said adhesive material is a mixture of synthetic resins.
 4. Apparatus according to claim 18, wherein said adhesive material is solid at room temperature and heating means are provided in said reservoir and said first roller for maintaining said material in a liquid state.
 5. Apparatus according to claim 4, wherein said heating means comprises thermostatically controlled electric heaters.
 6. Apparatus according to claim 2, wherein said rollers are operatively connected to an electric driving motor through a friction coupling which enables the drive to slip under overload conditions.
 7. Apparatus according to claim 2, wherein an adjustable scraper is provided for regulating the amount of adhesive material picked up by said first roller.
 8. Apparatus according to claim 2, wherein a plurality of said first and second rollers are respectively mounted at intervals on a pair of parallel shafts.
 9. Apparatus for forming wound rolls of sheet material comprising a reservoir for containing adhesive material in liquid form, a first roller rotatably mounted above said reservoir with a portion of its periphery dipping into said adhesive material, a second roller rotatably about an axis parallel to said first roller and spaced therefrom by an amount less than the diameter of a roll of said material to be treated, means for cooling said second roller by water circulated therein, means for driving said rollers at the same speed in the same direction, delivery means for receiving a wound roll of said material and depositing it in the nip between said rollers, and ejector means operable in unison with said delivery means for ejecting a roll after application of a circumferential band of adhesive material thereto.
 10. Apparatus for forming wound rolls of sheet material comprising a reservoir for containing adhesive material in liquid form, a first roller rotatably mounted above said reservoir with a portion of its periphery dipping into said adhesive material, a second roller rotatably mounted about an axis parallel to said first roller and spaced therefrom by an amount less than the diameter of a roll of said material to be treated, means for driving said rollers at the same speed in the same direction, delivery means for receiving a wound roll of said material and depositing it in the nip between said rollers, said delivery means including a trough pivotally mounted on arms secured to a shaft which is alternately rotatable in opposite directions by a pneumatic actuator the delivery stroke of which moves said trough from an upper position in which it receives a wound roll to a lower position in which it deposits the roll in the nip between said rollers, and the return stroke of which is operative to return said trough to its upper position, and ejector means operable in synchronism with said delivery means for ejecting a roll after application of said band of adhesive material thereto.
 11. Apparatus according to claim 10, wherein means secured to the ends of said trough and having a pin-and-slot connection with parts of a fixed frame are operative to pivot said trough relative to said arms during its movement between said upper and lower positions.
 12. Apparatus according to claim 10, wherein said trough is pivotally mounted on pins the outer ends of which engage cam-like guide members on parts of a fixed frame and the inner ends of which serve to engage and locate the ends of a roll during delivery movement of the trough.
 13. Apparatus according to claim 10, wherein said ejector means comprises rods secured to said third shaft and movable thereby into engagement with a roll during the return stroke of said actuator to eject the roll from the nip between said rollers.
 14. Apparatus according to claim 10, wherein means are provided for delaying the return stroke of said actuator until said rollers have performed more than one complete revolution. 